Digital BW, The Print

Hi all,
I have been getting QTR to work on the 980 with help from Roy. The dot tuning 
needed to be done for that printer as well. Note that this is actually a gimpprint issue 
rather than one at the QTR level.  Basically, the driver needs to have an accurate value 
for the size of the dots, particularly if there is more than one dot size.  On the 980 
the large dots were correct, but the smaller dots were off. The result was bad 
transitions where the dot size chosen by the driver switched over. This was evident as 
a poor gradient in a density range where only one ink was being printed, and gave the 
impression of poor dithering.  Once we got the value of the smaller dots corrected, it 
made a huge difference. I have a print of a portrait of a child where the dot transitions 
in the face are so smooth it is unbelievable. I have looked at it under 6.5x 
magnification and the face is still smooth.  So in a word, hold on for a while, and the 
results will improve dramatically, I am sure. 

I will try and scan this image for upload.

Costa


--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Peter Baumbach" 
<info@p...> wrote:
> Thank  you, Roy.  BTW, the linearization feature works great. I 
> measured the step wedge with the Eye One, and everything was done in 
> a few minutes.
> 
> Peter
> 
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Roy Harrington" 
> <roy@h...> wrote:
> > 
> > Hi Peter,
> > 
> > Gimp-print for the 7600/9600 hasn't been tuned for these printers 
> yet.
> > There are too many 2880dpi options and they are not working 
> correctly.
> > However with matte paper and matte ink, I don't think the 2880 res 
> should
> > be used.
> > 
> > I believe that 1440x720 should be the optimal resolution.  Although 
> it
> > works, you are right that the dots are too big.  I've been working 
> on that
> > issue and I think I've found the problem.  Once I'm sure all the 
> dots sizes
> > are being used I can tune the relative sizes.  I don't think this 
> should be
> > very far away.
> > 
> > I'm not sure what dithering issues you are seeing but it may be 
> because of
> > the large dots.  Also I've found I like the "ordered" dithering a 
> little better.
> > 
> > Roy
> >